Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Em que data foi o resultado w 20-17?
 ###Tabelas: CREATE TABLE convertible (convertible_id AUTO_INCREMENT PRIMARY KEY, Interior/Roof VARCHAR, Black (UA) INT, Red (E8) INT, White (ZR) INT, Green (SW) INT, Totals INT) CREATE TABLE united_kingdom_channel_4 (united_kingdom_channel_4_id AUTO_INCREMENT PRIMARY KEY, Episode number INT, Title VARCHAR, Original airing on Channel 4 VARCHAR, Time of airing on Channel 4 VARCHAR, Original airing on E4 VARCHAR, Time of airing on E4 VARCHAR, Position in Channel 4s ratings a VARCHAR, Position in E4s ratings b VARCHAR, Total viewers VARCHAR) CREATE TABLE immigration_by_state (immigration_by_state_id AUTO_INCREMENT PRIMARY KEY, North Carolina VARCHAR, 273.7% VARCHAR, South Carolina VARCHAR, 132.1% VARCHAR, Mississippi VARCHAR, 95.8% VARCHAR, Wisconsin VARCHAR, 59.4% VARCHAR, Vermont VARCHAR, 32.5% VARCHAR) CREATE TABLE mps_1832–1885:_macclesfield_parliamentary_borough (mps_1832–1885:_macclesfield_parliamentary_borough_id AUTO_INCREMENT PRIMARY KEY, Election INT, 1st Member VARCHAR, 1st Party VARCHAR, 2nd Member VARCHAR, 2nd Party VARCHAR) CREATE TABLE schedule (schedule_id AUTO_INCREMENT PRIMARY KEY, Week INT, Date VARCHAR, Opponent VARCHAR, Result VARCHAR, Game site VARCHAR, Record VARCHAR, Attendance VARCHAR)  
SELECT Date FROM schedule WHERE Result = w 20-17